Ashcroft^® 1127 and 1128 series differential pressure gauges display the difference of two separate inputs on one dial indicator. Both series have open front cases made from aluminum and the 1128 is offered with “0” at the 12 o’clock position on the dial with positive pressure on either side of zero. This series also offers a built in back flange for surface or wall mounting.  When the process media is corrosive to the gauge wetted parts, a diaphragm seal with capillary is available.